CodeMandatory
Floodplain construction
IRC R301.2.4Description
Buildings in flood hazard areas must comply with R322: lowest floor elevation, anchorage, flood-resistant materials, breakaway walls.
Why this exists
Flood damage is preventable with proper elevation and material choice; the IRC ties to FEMA flood maps.
Categories
Life safetyStructureSite
Source
ICCno manifest entry
International Residential Code (2024)
Section: R301.2.4 → R322
Published 2024-01-01 · last verified 2026-05-09
Solver enforcement
Browsable only — the solver does not currently enforce this directive (no spec-level data to check against). This entry exists so the architect personas can cite it in conversation and the user can read what the rule says.
Related directives
- Garage / dwelling fire separation · IRC R302.6
- Habitable space minimum ceiling height · IRC R305.1
- Egress window net opening dimensions · IRC R310.2
- Stair riser, tread, and headroom · IRC R311.7
- Smoke alarms required throughout dwelling · IRC R314
Last reviewed 2026-05-09.